And caused a gourd tree (a trunkless tree) to grow over him (manifested fruits of divine gnosis through him).
Sayyed Abbas Sadr-Ameli
And We caused to grow over him a plant of gourds.
Al-muntakhab fi tafsir al-Qur'an al-Karim
We caused a tree to grow over him for protection, a tree which grew decumbently and straggingly to a considerable length so as to rest upon the ground (possibly some kind of pumpkin)